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Finding the Fourth Proportional to 916.99, 1,375.89 and 430.39

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Solution

The fourth proportional to 916.99, 1,375.89 and 430.39 is: 645.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.99 : 1,375.89 = 430.39 : x
  2. Step 2: Convert to fraction form
    916.99/1,375.89 = 430.39/x
  3. Step 3: Cross multiply
    916.99x = 1,375.89 × 430.39
  4. Step 4: Simplify right side
    916.99x = 592,169.30
  5. Step 5: Solve for x
    x = 592,169.30/916.99
  6. Step 6: Final answer
    x = 645.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.